.TH v.import 1grass "" "GRASS 7.2.0" "Grass User's Manual"
.SH NAME
\fI\fBv.import\fR\fR  \- Imports vector data into a GRASS vector map using OGR library and reprojects on the fly.
.SH KEYWORDS
vector, import, projection
.SH SYNOPSIS
\fBv.import\fR
.br
\fBv.import \-\-help\fR
.br
\fBv.import\fR [\-\fBflo\fR] \fBinput\fR=\fIstring\fR  [\fBlayer\fR=\fIstring\fR[,\fIstring\fR,...]]   [\fBoutput\fR=\fIname\fR]   [\fBextent\fR=\fIstring\fR]   [\fBencoding\fR=\fIstring\fR]   [\fBsnap\fR=\fIfloat\fR]   [\fBepsg\fR=\fIinteger\fR]   [\fBdatum_trans\fR=\fIinteger\fR]   [\-\-\fBoverwrite\fR]  [\-\-\fBhelp\fR]  [\-\-\fBverbose\fR]  [\-\-\fBquiet\fR]  [\-\-\fBui\fR]
.SS Flags:
.IP "\fB\-f\fR" 4m
.br
List supported OGR formats and exit
.IP "\fB\-l\fR" 4m
.br
List available OGR layers in data source and exit
.IP "\fB\-o\fR" 4m
.br
Override projection check (use current location\(cqs projection)
.br
Assume that the dataset has the same projection as the current location
.IP "\fB\-\-overwrite\fR" 4m
.br
Allow output files to overwrite existing files
.IP "\fB\-\-help\fR" 4m
.br
Print usage summary
.IP "\fB\-\-verbose\fR" 4m
.br
Verbose module output
.IP "\fB\-\-quiet\fR" 4m
.br
Quiet module output
.IP "\fB\-\-ui\fR" 4m
.br
Force launching GUI dialog
.SS Parameters:
.IP "\fBinput\fR=\fIstring\fR \fB[required]\fR" 4m
.br
Name of OGR datasource to be imported
.IP "\fBlayer\fR=\fIstring[,\fIstring\fR,...]\fR" 4m
.br
OGR layer name. If not given, all available layers are imported
.IP "\fBoutput\fR=\fIname\fR" 4m
.br
Name for output vector map (default: input)
.IP "\fBextent\fR=\fIstring\fR" 4m
.br
Output vector map extent
.br
Options: \fIinput, region\fR
.br
Default: \fIinput\fR
.br
\fBinput\fR: extent of input map
.br
\fBregion\fR: extent of current region
.IP "\fBencoding\fR=\fIstring\fR" 4m
.br
Encoding value for attribute data
.IP "\fBsnap\fR=\fIfloat\fR" 4m
.br
Snapping threshold for boundaries (map units)
.br
\(cq\-1\(cq for no snap
.br
Default: \fI1e\-13\fR
.IP "\fBepsg\fR=\fIinteger\fR" 4m
.br
EPSG projection code
.br
Options: \fI1\-1000000\fR
.IP "\fBdatum_trans\fR=\fIinteger\fR" 4m
.br
Index number of datum transform parameters
.br
\-1 to list available datum transform parameters
.br
Options: \fI\-1\-100\fR
.SH DESCRIPTION
\fIv.import\fR imports vector data from files and database connections
supported by the OGR library) into the
current location and mapset. If the projection of the input
does not match the projection of the location, the input is reprojected
into the current location. In case that the projection of the input map
does match the projection of the location, the input is imported directly.
.SS Supported Vector Formats
\fIv.import\fR uses the OGR library which supports various vector data
formats including ESRI
Shapefile, Mapinfo
File, UK .NTF, SDTS, TIGER, IHO S\-57 (ENC), DGN, GML, GPX, AVCBin, REC,
Memory, OGDI, and PostgreSQL, depending on the local OGR installation.
For details see the OGR web
site. The OGR (Simple Features Library) is part of the
GDAL library, hence GDAL needs to be
installed to use \fIv.in.ogr\fR.
.PP
The list of actually supported formats can be printed by \fB\-f\fR flag.
.SH NOTES
.SS Topology cleaning
When importing polygons, non\-topological polygons are converted to
topological areas. By default, a very small snapping threshold is applied
(1e\-13 map units) to avoid topological errors caused by numerical inaccuracy
of the input data format. If the original polygons contain errors (unexpected
overlapping areas or small gaps between polygons), the import might
need to be repeated using a larger \fIsnap\fR value.
.PP
The \fIsnap\fR threshold defines the maximal distance from one to another
vertex in map units (for latitude\-longitude locations in degree). If there
is no other vertex within \fIsnap\fR distance, no snapping will be done.
Note that a too large value can severely damage area topology, beyond repair.
.PP
\fIPost\-processing:\fR Snapped boundaries may need to be cleaned with
\fIv.clean\fR, using its tools \fIbreak,rmdupl,rmsa\fR. For details,
refer to the \fIv.clean\fR manual page.
.SH EXAMPLE
.br
.nf
\fC
# import SHAPE file at full extent and reproject to current location projection
v.import input=research_area.shp output=research_area extent=input
\fR
.fi
.SH SEE ALSO
\fI
v.clean,
v.in.ogr,
v.proj
\fR
.SH AUTHORS
Markus Metz
.br
Improvements: Martin Landa, Anna Petrasova
.PP
\fILast changed: $Date: 2016\-08\-06 18:34:49 +0200 (Sat, 06 Aug 2016) $\fR
.SH SOURCE CODE
.PP
Available at: v.import source code (history)
.PP
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.PP
© 2003\-2016
GRASS Development Team,
GRASS GIS 7.2.0 Reference Manual